Abstract: A work apparatus has an engine with a carburetor. An actuating element is connected to the choke shaft of the choke element of the carburetor. An operating mode selector has operating, warm start and cold start positions and is connected fixedly in terms of rotation to an adjusting element. The actuating element is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The selector is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The ratio of the pivot angle (?2) to the pivot angle (?1) is at least approximately 1.5 times the ratio of the pivot angle (?2) to the pivot angle (?1).

Abstract: An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod (6), a crankshaft (7) pivotably mounted in a crankcase. The connecting rod is connected to the piston via a piston pin. An inlet window for combustion air is provided and controlled by the piston. The piston separates a combustion chamber from the crankcase interior space and has a piston base the underside of which is oriented toward the crankcase. To achieve good cooling of the piston and of the piston pin bearing, a first flow-guide element is provided within the crankcase interior space adjacent to the inlet window. The first flow-guide element redirects the combustion air flowing in through the inlet window in the direction of the underside of the piston base.

Abstract: A work apparatus has an engine with a carburetor. An actuating element is connected to the choke shaft of the choke element of the carburetor. An operating mode selector has operating, warm start and cold start positions and is connected fixedly in terms of rotation to an adjusting element. The actuating element is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The selector is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The ratio of the pivot angle (?2) to the pivot angle (?1) is at least approximately 1.5 times the ratio of the pivot angle (?2) to the pivot angle (?1).

Abstract: An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod (6), a crankshaft (7) pivotably mounted in a crankcase. The connecting rod is connected to the piston via a piston pin. An inlet window for combustion air is provided and controlled by the piston. The piston separates a combustion chamber from the crankcase interior space and has a piston base the underside of which is oriented toward the crankcase. To achieve good cooling of the piston and of the piston pin bearing, a first flow-guide element is provided within the crankcase interior space adjacent to the inlet window. The first flow-guide element redirects the combustion air flowing in through the inlet window in the direction of the underside of the piston base.